[PATCH 6.8 554/715] phy: qcom: qmp-usbc: add support for the Type-C handling

Sasha Levin
2024-03-24T22:44:06Z

From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

[ Upstream commit dfdaba27b4660ec26de955cf4459499ddb005e2d ]

The USB-C PHYs on the msm8998, QCM2290 and SM6115 platforms use special
register to control which lanes of the Type-C port are used for the
SuperSpeed USB connection. Mimic the qmp-combo driver and handle this
register.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20240113-pmi632-typec-v2-12-182d9aa0a5b3@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Stable-dep-of: 01b086ccdeff ("phy: qcom: qmp-usbc: handle CLAMP register in a correct way")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/phy/qualcomm/phy-qcom-qmp-usbc.c | 97 +++++++++++++++++++++++-
1 file changed, 94 insertions(+), 3 deletions(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-usbc.c b/drivers/phy/qualcomm/phy-qcom-qmp-usbc.c
index 52f1b3f7b81eb..214cf4203de41 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp-usbc.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp-usbc.c
@@ -18,6 +18,8 @@
#include <linux/regulator/consumer.h>
#include <linux/reset.h>
#include <linux/slab.h>
+#include <linux/usb/typec.h>
+#include <linux/usb/typec_mux.h>

#include "phy-qcom-qmp.h"
#include "phy-qcom-qmp-pcs-misc-v3.h"
@@ -374,11 +376,17 @@ struct qmp_usbc {
struct reset_control_bulk_data *resets;
struct regulator_bulk_data *vregs;

+ struct mutex phy_mutex;
+
enum phy_mode mode;
+ unsigned int usb_init_count;

struct phy *phy;

struct clk_fixed_rate pipe_clk_fixed;
+
+ struct typec_switch_dev *sw;
+ enum typec_orientation orientation;
};

static inline void qphy_setbits(void __iomem *base, u32 offset, u32 val)
@@ -497,6 +505,7 @@ static int qmp_usbc_init(struct phy *phy)
struct qmp_usbc *qmp = phy_get_drvdata(phy);
const struct qmp_phy_cfg *cfg = qmp->cfg;
void __iomem *pcs = qmp->pcs;
+ u32 val = 0;
int ret;

ret = regulator_bulk_enable(cfg->num_vregs, qmp->vregs);
@@ -523,6 +532,14 @@ static int qmp_usbc_init(struct phy *phy)

qphy_setbits(pcs, cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL], SW_PWRDN);

+#define SW_PORTSELECT_VAL BIT(0)
+#define SW_PORTSELECT_MUX BIT(1)
+ /* Use software based port select and switch on typec orientation */
+ val = SW_PORTSELECT_MUX;
+ if (qmp->orientation == TYPEC_ORIENTATION_REVERSE)
+ val |= SW_PORTSELECT_VAL;
+ writel(val, qmp->pcs_misc);
+
return 0;

err_assert_reset:
@@ -620,23 +637,34 @@ static int qmp_usbc_power_off(struct phy *phy)

static int qmp_usbc_enable(struct phy *phy)
{
+ struct qmp_usbc *qmp = phy_get_drvdata(phy);
int ret;

+ mutex_lock(&qmp->phy_mutex);
+
ret = qmp_usbc_init(phy);
if (ret)
- return ret;
+ goto out_unlock;

ret = qmp_usbc_power_on(phy);
- if (ret)
+ if (ret) {
qmp_usbc_exit(phy);
+ goto out_unlock;
+ }
+
+ qmp->usb_init_count++;
+out_unlock:
+ mutex_unlock(&qmp->phy_mutex);

return ret;
}

static int qmp_usbc_disable(struct phy *phy)
{
+ struct qmp_usbc *qmp = phy_get_drvdata(phy);
int ret;

+ qmp->usb_init_count--;
ret = qmp_usbc_power_off(phy);
if (ret)
return ret;
@@ -874,6 +902,61 @@ static int phy_pipe_clk_register(struct qmp_usbc *qmp, struct device_node *np)
return devm_add_action_or_reset(qmp->dev, phy_clk_release_provider, np);
}

+#if IS_ENABLED(CONFIG_TYPEC)
+static int qmp_usbc_typec_switch_set(struct typec_switch_dev *sw,
+ enum typec_orientation orientation)
+{
+ struct qmp_usbc *qmp = typec_switch_get_drvdata(sw);
+
+ if (orientation == qmp->orientation || orientation == TYPEC_ORIENTATION_NONE)
+ return 0;
+
+ mutex_lock(&qmp->phy_mutex);
+ qmp->orientation = orientation;
+
+ if (qmp->usb_init_count) {
+ qmp_usbc_power_off(qmp->phy);
+ qmp_usbc_exit(qmp->phy);
+
+ qmp_usbc_init(qmp->phy);
+ qmp_usbc_power_on(qmp->phy);
+ }
+
+ mutex_unlock(&qmp->phy_mutex);
+
+ return 0;
+}
+
+static void qmp_usbc_typec_unregister(void *data)
+{
+ struct qmp_usbc *qmp = data;
+
+ typec_switch_unregister(qmp->sw);
+}
+
+static int qmp_usbc_typec_switch_register(struct qmp_usbc *qmp)
+{
+ struct typec_switch_desc sw_desc = {};
+ struct device *dev = qmp->dev;
+
+ sw_desc.drvdata = qmp;
+ sw_desc.fwnode = dev->fwnode;
+ sw_desc.set = qmp_usbc_typec_switch_set;
+ qmp->sw = typec_switch_register(dev, &sw_desc);
+ if (IS_ERR(qmp->sw)) {
+ dev_err(dev, "Unable to register typec switch: %pe\n", qmp->sw);
+ return PTR_ERR(qmp->sw);
+ }
+
+ return devm_add_action_or_reset(dev, qmp_usbc_typec_unregister, qmp);
+}
+#else
+static int qmp_usbc_typec_switch_register(struct qmp_usbc *qmp)
+{
+ return 0;
+}
+#endif
+
static int qmp_usbc_parse_dt_legacy(struct qmp_usbc *qmp, struct device_node *np)
{
struct platform_device *pdev = to_platform_device(qmp->dev);
@@ -994,16 +1077,24 @@ static int qmp_usbc_probe(struct platform_device *pdev)

qmp->dev = dev;

+ qmp->orientation = TYPEC_ORIENTATION_NORMAL;
+
qmp->cfg = of_device_get_match_data(dev);
if (!qmp->cfg)
return -EINVAL;

+ mutex_init(&qmp->phy_mutex);
+
ret = qmp_usbc_vreg_init(qmp);
if (ret)
return ret;

+ ret = qmp_usbc_typec_switch_register(qmp);
+ if (ret)
+ return ret;
+
/* Check for legacy binding with child node. */
- np = of_get_next_available_child(dev->of_node, NULL);
+ np = of_get_child_by_name(dev->of_node, "phy");
if (np) {
ret = qmp_usbc_parse_dt_legacy(qmp, np);
} else {
--
2.43.0